# Include or exclude classes or packages for a Hadoop configuration

You have the option to include or exclude classes or packages from loading with a Hadoop configuration.

Configure these options within the `plugin.properties` file located at `plugins/pentaho-big-data-plugin`. For additional information, see the comments within the `plugin.properties` file.

* **Include Additional Class Paths or Libraries**

  To include additional class paths, native libraries, or a user-friendly configuration name, include the directory within **classpath** property within the big data `plugin.properties` file.
* **Exclude Classes or Packages**

  To exclude classes or packages from duplicate loading by a Hadoop configuration class loader, include them in the **ignored.classes** property within the `plugin.properties` file. This is necessary when logging libraries expect a single class shared by all class loaders, as with Apache Commons Logging for example


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